warning: The LHS character len=1 and the RHS character len=4 are not equal.
 --> tests/warnings/character_01.f90:3:5
  |
3 |     character(len=1, kind=1), parameter :: c_null_char = "ball"
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider changing the RHS character len to match the LHS character len
