My initial travel plan was to stay seven days in Germany, four days in Switzerland and five days in Italy. I approached the German consulate and secured a visa. Now due to issues I will be staying only one day in Germany and rest of trip stays the same. Will this create an issue when I try to enter Germany?
I don't think it will be an issue.
Your visa into Germany gets you into all Schengen countries. Once in the Shengen area, your visa will only be checked again once you leave Shengen area. Security checks do take place at airports (and randomly sometimes on trains or on the street), but only to confirm the person named in the passport and you are the same person. If your visa is in order, and you are not making problems, you will be fine. (About ten days ago I traveled from Hamburg Zurich Barcelona with a non-EU passport holder and we only got checked during boarding in Hamburg)
Business travelers have changes to their agenda regularly and even if you are not traveling for personal reasons, I don't see anyone being bothered.
Before someone points out that Switzerland is not Schengen, yes, I know - but it has special relationship for the free movement of people, not goods.
Best of luck!