utils: move split_text into utils

diff --git a/main/ui/confirm_address.c b/main/ui/confirm_address.c
index b2d3b69..842a57f 100644
--- a/main/ui/confirm_address.c
+++ b/main/ui/confirm_address.c
@@ -1,6 +1,7 @@
 #ifndef AMALGAMATED_BUILD
 #include "../button_events.h"
 #include "../ui.h"
+#include "../utils/util.h"
 #include "jade_assert.h"
 
 // Should the address be displayed a formatted grid, or as a single long string (traditional)
@@ -19,43 +20,6 @@
 
 #define ADDR_GRID_SIZE (ADDR_GRID_X * ADDR_GRID_Y)
 #define ADDR_TEXTSPLITLEN (MAX_DISPLAY_ADDRESS_LEN / ADDR_GRID_SIZE)
-
-// The length of the required buffer to hold 'len' characters
-// with a nul-terminator injected every 'wordlen' characters, and
-// at the very end.  eg. for "abcdefhij\0" -> "abc\0def\0ghi\0j\0"
-#define SPLIT_TEXT_LEN(len, wordlen) (len + (len / wordlen) + 1)
-
-// Helper to copy text from one buffer to another, where the destination has terminators every
-// 'wordlen' chars, eg: "abcdefghi\0" -> "abc\0def\0ghi\0j\0"
-// output 'num_words' is number of 'words' written - eg. 4
-// output 'written' is number iof bytes written, including all '\0's - eg. 14
-static void split_text(const char* src, const size_t len, const size_t wordlen, char* output, const size_t output_len,
-    size_t* num_words, size_t* written)
-{
-    JADE_ASSERT(src);
-    JADE_ASSERT(wordlen);
-    JADE_ASSERT(output);
-    JADE_ASSERT(output_len >= SPLIT_TEXT_LEN(len, wordlen));
-    JADE_INIT_OUT_SIZE(num_words);
-    JADE_INIT_OUT_SIZE(written);
-
-    size_t read = 0;
-    size_t write = 0;
-    while (read < len) {
-        const size_t remaining = len - read;
-        const size_t nchars = remaining > wordlen ? wordlen : remaining;
-
-        JADE_ASSERT(write + nchars + 1 <= output_len);
-        strncpy(output + write, src + read, nchars);
-        read += nchars;
-        write += nchars;
-
-        output[write++] = '\0';
-        ++*num_words;
-    }
-    JADE_ASSERT(write <= output_len);
-    *written = write;
-}
 #endif // ADDRESS_STRING_GRID
 
 // also used in sign_tx
diff --git a/main/utils/util.c b/main/utils/util.c
index 6386078..015d97d 100644
--- a/main/utils/util.c
+++ b/main/utils/util.c
@@ -66,4 +66,32 @@ bool is_potential_green_server_path(const uint32_t* path, const size_t path_len,
     *subaccount_out = path_len == MAX_GASERVICE_PATH_LEN ? path[path_len - 2] : 0;
     return true;
 }
+
+void split_text(const char* src, const size_t len, const size_t wordlen, char* output, const size_t output_len,
+    size_t* num_words, size_t* written)
+{
+    JADE_ASSERT(src);
+    JADE_ASSERT(wordlen);
+    JADE_ASSERT(output);
+    JADE_ASSERT(output_len >= SPLIT_TEXT_LEN(len, wordlen));
+    JADE_INIT_OUT_SIZE(num_words);
+    JADE_INIT_OUT_SIZE(written);
+
+    size_t read = 0;
+    size_t write = 0;
+    while (read < len) {
+        const size_t remaining = len - read;
+        const size_t nchars = remaining > wordlen ? wordlen : remaining;
+
+        JADE_ASSERT(write + nchars + 1 <= output_len);
+        strncpy(output + write, src + read, nchars);
+        read += nchars;
+        write += nchars;
+
+        output[write++] = '\0';
+        ++*num_words;
+    }
+    JADE_ASSERT(write <= output_len);
+    *written = write;
+}
 #endif // AMALGAMATED_BUILD
diff --git a/main/utils/util.h b/main/utils/util.h
index bb370a9..e4aabca 100644
--- a/main/utils/util.h
+++ b/main/utils/util.h
@@ -86,6 +86,18 @@ static inline void map_string(char* s, int (*fnmap)(int))
     }
 }
 
+// The length of the required buffer to hold 'len' characters
+// with a nul-terminator injected every 'wordlen' characters, and
+// at the very end.  eg. for "abcdefhij\0" -> "abc\0def\0ghi\0j\0"
+#define SPLIT_TEXT_LEN(len, wordlen) (len + (len / wordlen) + 1)
+
+// Helper to copy text from one buffer to another, where the destination has terminators every
+// 'wordlen' chars, eg: "abcdefghi\0" -> "abc\0def\0ghi\0j\0"
+// output 'num_words' is number of 'words' written - eg. 4
+// output 'written' is number of bytes written, including all '\0's - eg. 14
+void split_text(
+    const char* src, size_t len, size_t wordlen, char* output, size_t output_len, size_t* num_words, size_t* written);
+
 // Bip32 path utils
 static inline bool ishardened(const uint32_t n) { return n & 0x80000000; }
 static inline uint32_t harden(const uint32_t n) { return n | 0x80000000; }