Is there any practical “go to” book that demonstrates the main dsp methods for time series written in C for practical applications? (Doesn’t have to be for hardware, but for any raw data such as sensors, stocks, etc).
If you want a single book on C programming with DSP, then I would refer to the classical one
C (Language) Algorithms for Real-Time DSP
from Paul M. Embree. And as far as I know, there is no modern version to beat it's simplicity, clarity and usefulness...