started working on scrolling, enter key works now

final/dynstr.c

@@ -156,10 +156,35 @@ String_t* str_split(String_t* self, int* res_len, char c) {
     return elements;
 }
 
+String_t str_merge(String_t* s1, String_t* s2) {
+    String_t s;
+    s.size = s1->size + s2->size;
+    s.capacity = s.size;
+    s.data = (char*)calloc(s.size, sizeof(char));
+    for (int i = 0; i < s1->size; i++) {
+        s.data[i] = s1->data[i];
+    }
+    for (int i = 0; i < s2->size; i++) {
+        s.data[s1->size + i] = s2->data[i];
+    }
+    return s;
+}
+
 String_t* str_lines(String_t* self, int* numlines) {
     return str_split(self, numlines, '\n');
 }
 
+String_t str_slice(String_t* s, int start, int end) {
+    String_t s2;
+    s2.size = end - start;
+    s2.capacity = s2.size;
+    s2.data = (char*)calloc(s2.size, sizeof(char));
+    for (int i = 0; i < s2.size; i++) {
+        s2.data[i] = s->data[start + i];
+    }
+    return s2;
+}
+
 int str_len(String_t* s) {
     return s->size;
 }