charArray method
Implementation
void charArray(String value, int length) {
final encoded = utf8.encode(value);
final writeLen = encoded.length.clamp(0, length - 1);
for (int i = 0; i < writeLen; i++) {
WasmMemory.writeUint8(_cur, i, encoded[i]);
}
WasmMemory.writeUint8(_cur, writeLen, 0); // null terminator
_cur += length;
}