Walgreens was the worst stock in the Dow last year. Here's how the CEO is betting a partnership with a tech giant can help it recover.

· Walgreens is having a tough time. 
· The pharmacy giant's stock dropped 10% so far this year, after its financial results missed Wall Street's expectations. The company finished 2019 as the worst-performing stock on the Dow Jones Industrial Average.
· Declining reimbursements for prescription drugs, competition with other...