learning-cc4e

Solution to https://cc4e.com/. If you copy these you're not right in the head.
git clone https://kaka.farm/~git/learning-cc4e
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solution.c (527B)

      1 /* x = x + 'h'; */
      2 
      3 void pystr_append(struct pystr* self, char ch) {
      4   if (self->length + 1 >= self->alloc) {
      5     self->alloc += 10;
      6     self->data = realloc(self->data, self->alloc);
      7   }
      8   self->data[self->length] = ch;
      9   self->data[++self->length] = '\0';
     10 }
     11 
     12 /* x = x + "hello"; */
     13 
     14 void pystr_appends(struct pystr* self, char *str) {
     15   for (; *str != '\0'; ++str) {
     16     pystr_append(self, *str);
     17   }
     18 }
     19 
     20 /* x = "hello"; */
     21 
     22 void pystr_assign(struct pystr* self, char *str) {
     23   self->length = 0;
     24   pystr_appends(self, str);
     25 }