A newbie needs help with a macd script

Hello, I'm a beginner and I'm working on a new script, one of the long conditions of the script is that the macd historigram is green (the color col_fall_above) and not light green (col_grow_above), the short condition is the opposite . So I copied the macd indicator code and tried something on line 20 but the error message line 20: Syntax error at input '>='. appears.
Would anyone be kind enough to help me and/or give me advice?
Thanks in advance.

1) the longcondition and shortcondition variables aren't declared before so you're calling some void friend

2) the line 20 should be captured in a variable by adding something before like
cond =