fix bug in stringInsertBytesAtMaybeAlloc()

math.c

@@ -149,6 +149,13 @@ fn u64 u64SafeMul(u64 x, u64 y) {
 fn f32 f32FromString(String s) {
   f32 result = 0.0f;
   if (s.length == 0) { return result; }
+  // TODO handle +/- for sign
+  /*
+   * while (*s == ' ') s++;
+    float sign = 1.0f;
+    if (*s == '-') { sign = -1.0f; s++; }
+    else if (*s == '+') s++;
+   * */
   ptr c = s.bytes;
   while (*c >= '0' && *c <= '9') {
     result = result * 10.0f + (*c++ - '0');