Nasm is not recognized as internal or external command

I am working on a java compiler project coded in python open source github link ishttps://github.com/abhigarg-iitk/java_compiler this compileris working and converting java file into assembly language but nasm and gcc not working. I have installed nasm already and still getting the same error message.Nasm errror on command prompt1

[Nasm error on command prompt 2][2]