Update the truncate number function to use decimal point (#333)

* Fixed to truncate as "1.234M" instead of "1234K"

* Optimized by switching to strings to avoid divisions

* Changed FP constants to strings

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

source/font.c

@@ -1,22 +1,29 @@
 #include "font.h"
 
-#include "tonc.h"
+#include "util.h"
+
+#include <stdlib.h>
 
 static const char* s_font_point_lookup[] = {
-    XSTR(FP0_CHAR),
-    XSTR(FP1_CHAR),
-    XSTR(FP2_CHAR),
-    XSTR(FP3_CHAR),
-    XSTR(FP4_CHAR),
-    XSTR(FP5_CHAR),
-    XSTR(FP6_CHAR),
-    XSTR(FP7_CHAR),
-    XSTR(FP8_CHAR),
-    XSTR(FP9_CHAR),
+    FP0_STR,
+    FP1_STR,
+    FP2_STR,
+    FP3_STR,
+    FP4_STR,
+    FP5_STR,
+    FP6_STR,
+    FP7_STR,
+    FP8_STR,
+    FP9_STR,
 };
 
 const char* get_font_point_str(int val)
 {
-    val = ABS(val) % 10;
+    val = abs(val) % 10;
     return s_font_point_lookup[val];
 }
+
+char digit_char_to_font_point(char digit_char)
+{
+    return get_font_point_str(digit_char - '0')[0];
+}