emojicode, 88 bytes

Result

WA

Code [DL]

🏁🍇
  🍮 s 🔤hello🔤
  🍮 char s 4
  😀 🍪🔤Howdy, 🔤 char🍪
🍉

stdin

11001111
11001101
01111011
00010001
00001010
10000110
01111000
00101000
11010000
10001000
01010101
10111000
11100110
11111000
00000110
10011001
10000000
10111110
10000010
10110000
11100001
01101001
00000000
00001001
11101010
01111110
11110010
10101011
10101011
00010101
11111101
00101101
10000011
00001111
00110111
01000010
00110100
01001110
11010101
11010010
01011011
00000011
00011100
10010110
00111111
00000001
11101000
11100111
00000001
00100100

stdout

Howdy, hello

stderr

⚠️ line 3 col 15 /tmp/code.emojic: Statement seems to have no effect whatsoever.
⚠️ line 3 col 8 /tmp/code.emojic: Variable "char" was never mutated; consider making it a frozen 🍦 variable.
⚠️ line 2 col 8 /tmp/code.emojic: Variable "s" was never mutated; consider making it a frozen 🍦 variable.

strace