Spec: The goal of this exercise is to implement the 'strcpy' function, as provided by libc, in ARM Assembler.

Input: 2 pointers to the source and the destination string
Result: the source string should be copied to the destination string

Before:

  srcstr
    |
    |
    v
  ------------------------------------
  | H | e | l | l | o | \0 |
  ------------------------------------

  ------------------------------------
  | T | e | x | t | \0 |
  ------------------------------------
    ^
    |
    |
  dststr

After:

  srcstr
    |
    |
    v
  ------------------------------------
  | H | e | l | l | o | \0 |
  ------------------------------------

  ------------------------------------
  | H | e | l | l | o | \0 |
  ------------------------------------
    ^
    |
    |
  dststr